Paving rammer



Sept. 18, 192x. E. H. cARLssoN PAVING RAMMER FiledA sept. 22, 192e 2 sheets-sheet 1 Afr Hrm. Mfr/c masso/v INVENTOR;

. y Bj Q.

* Attomeyp' Sept. 18, 1928. 1,684,574

E. H. cARLssoN 'PAVING RAMMER Filed Sept. 22, 1926 2 Sheets-Sheet 2.

eA/5 r Hna Maz lv/EL 5 5 nu INVENTOR;

By. 'I lmomey.

ber (usually in the lifting member where Figure 2 isa v Patented Sept.

` Application mealseptembeaa, i926,

Fernie The present invention reters'to apparatus or rainniing paving stones or the like and working with a rammer moving up; and

down and which by means o a litting'memshape of abelt-or the'lilge) is connected to an oscillating memberadapted to be connected to and rotatable driving as to allow the said oscillating! member, when being connected,

of the driving member tor a suitable distance f the ranimer, the drivingineinber so as to inorder to raise disconected 'trom disconnected from a member in such a manner to partake' in the`motion but then' to be be returned by the action ofv the rammer falling `freely downwards.

Tlie'said returnf ing or the oscillating member is etleoted with `lvery great speedonaccountof the considerable weight or the rammer and the ycompa-rmv tively great height of fall@ As soon `as-the rammer has fallen down the oscillating inol tion of the said as very g pended, the said member to burst vention has for its object a member must be stopped Oreat strains should else occurii'ithe' fthe, rammer v is sus* strains causing the lifting sooner or later.l

acting successively for stopping the oscil- `l lating member,

rammer has fallen down.

' immediately v afterV Athe A suitable form of the invention isf shown in the annexed dr awings where i Figure 1 is aplan View otheiapparatus.

of FigureV '1, position. Figure tion showing' he tion.` Figures 4 apparatus Corresp ertical section onthe line 2,--,2y Vshowing the rainmer.l inv raised 3 is a similar vertical secrainmer in lowered posiand 5 are end views of the onding to Figures 2 and 3.

The rammer 1 is connected by a belt 2 or another vflexible l lating member in iting member to an- Yosciltlie shape of a'drum 3 being in known manner automatically connected to and disconnected :troni a rotating driving lmember in the shape off a sleeved communicating with a motor VV'hen the drum n e4 rotating in the direction.v`

ra'wing) nected to the sleev (not shown in the 3 is being con,-

ot the arrow, Figure 2, the drum accompanies the rotating member l Vioi a dist-ance, the

rammer 1 being thereby raised 'from the nected from returned with great' speed by the falling viammelr, the drum beingy then ,again -conla rollerl 12' located in Y This in-y Vyielding.z brakev linto aV sleeve17 fixed jection V1,5 pressed upwards. e lWhenfthe ramnier 'falls the drum 3 is ro-V s0 down' the cam roller: 12 whereby the'arm 11 is swung down wardly. against the. action ofthe` spring 14. 'lvhenthe ycani 8 touches strong iriction the spring arm 11 is and successively irst by the roller 12y and `then also. by"l ySerial No; 137,702.3,1and Sweden August 1926,

ground.

-Vhen the drum is then disconthe said sleeve it 1s immediately nectedto the sleeve and so on. In order that' 55 the' rainmermay be guided during its. movements vertical rods 5 are providedI which are Vmovablein guidings 64 on the ytraine of the machine, the lower ends of the said rods beingv fixed to the -ramme-r. e

',lhe' drum 3 is -irmlyj connected to a hub 7,v Figures 1 to 3, mounted loosely yon the sleeved. `On the said hubrthere is a prof jectingl cam 8,' Figures 2 and 3; On thehub r"7 a cap 9 is loosely mounted,a pin 10 being 65 located in lthe interorof the said cap, one end .oit an arin 11 being pivotal 4ori-the said pin andy its other end beingprovidedfwith the same vertical plane 4 A slidable pin 13 orv the .like 70 rests against the arm 11 and isacted upon by a comparatively strong-,spring 14 tending asthe cani 8.

vto keep the said pin pressed againstthe arm 111. The cap Q'lia's a .projection 15, the free a groove 16, Figure Q, enters V75 to the frame of the .ma-

chine and enclosing a'comparatively weak spring`18which tends to maintain the proend of whichlbyrtated inthe direction indicatedby the arrow rv.in Figure 3, while the cap 9 loosely mounted VVVon thev hub 7 of .the drum-isv maintained in. the positionshown in Figure 2. by means. of theV spring 18. Assoon as the rammer falls 8 onv the hub 7 ,touches the vthe .said V.roller so.

is effected between Y,thecam oiiacicouiit of the action ofV ligas to bring the cap where the p locatedto rotate in the same di-V rection as the hub 7, thus iii the direction ot the arrow in yFigure 3, againstythe act-ion .5 of .the spring 18. '.The vdrum. 3 to which a very great speed is imparted'by the heavy rammer falling down is'thereby braked softly spring-actuated the spring18.

and the roller,

position shown in Figure 3 When the members have nearly reached the the movement of the hub 7 and the drum 3 has ceased.

When the drum 3 is again connected to the motor-driven sleeve 4 for raising the rammerthe drum and thehub willbe rotated anew in the direction indicated by the arrow in Figure 2 sothat the cam isbroughtout of contact with the roller, andthe vSpring 18 acting upon the projection "returns `the VAcap 9 into the initial position shown in Figure 2. When the rammer has reachedits raised position the members again occupy the posi-V tion shown in Figure 2, and they areV now ready to act at the next stroke ofthe rammer.

The brake device described above has been Y completed by a safety-device getting into function in case thebelt ber where the rammer burst. If the belt bursts when the rammer or the flexible memf is suspendedshould j is being raised, the drum 3 when` being disconnected from thesleeve 4-canno'tbe returned in the direction ofthe arrow, Figure account ofthe inertia. whereby touches the armll, thus preventinthe drum 1 the arm 3, by the falling rammer, Vas is normally the Y case, but the drum continues its movement in the udirection of the arrow, Figure 2, on the `cam 8 from continuing its movement. v utas the drum 3 is then as usual connected to the motor-driven sleeve 4 rotating inlthe direction vof the arrow,Figure 2, one of the members must of course burst. `In orderto prevent this the following measures have `been taken.

J At the end ofa stoppable shaft 19 on which the motor-driven sleeve r4 is rotating an arm 20 is jammed, Figures 1, 4 and 5, and on the adjacent wall of the drum 3 there isa projec v tion 21 located in the same vertical planeas 20. When the `rammer is in its;

` raised position, Figures 2 and 4 the prothe position shown in Figure jection 21 rests against the arm 20 or is in# the immediate vicinity when the rammer is in of same, Figure 4, and

Figures 3 and 5, the projection 21` occupies 5. As soonas the drum 3fhas been disconnected from the sleeve 4 the projection 21 hits the arm`20,

so that the drum, in case the belt2 should burst, cannot continue its rotation in the direction of the arrow, Figures 2 and 4. Usually, there is no risk ofthe drum continuing its rotation in the direction Figures 2 and 4, when being disconnected, as

drum occupies the said posit-ion` cannot get--` of Y the arrow,

it is at once rotated inthe opposite direction by the falling rammer. The drum 3 being stopped by just in the position occupied when being disconnected the drum\ cannot be connected again tothe motor-driven sleeve 4, as the; connecting means ofthe sleeve when the into connecting engagement with the drum. Consequently, the sleeve 4 is rotating freely, and no damage may be inliicted on the memcessively one after another.

its-lowermost position,

the arm V2()` and the projection 21l 4voscillating elementassociated with said driv` ing member, means to connect and* disconnect the oscillating element from the driving member whereby the oscillating element partakes of the movement-of `the driving member a predetermined distance and then disconnects from the ,member Vto permit theoscillatingelementto returnto its initial `position with fall of the ram, and a yieldableV braking means operating on said oscillating element to hold the latter stationary subsequent to the fall ofthe ram. ,j Y i e 2. A rarnming device, as claimed in claim 1, in which the braking `means consists of a,

plurality of braking membersV operating suc- 3. In a rammingmachineofthe characterq;- described,the combination. of an upright re- 95 ciprocating ram, and llifting means therefor, comprising a rotary driving member, an oscillating element associated with said driving member, means to connect and disconnect Athe oscillating element from the driving `10@ member `whereby thel oscillating element partakes` of the, movement of the driving member a predetermined distance and then disconnects from the member to. permit i the oscillating element to return to its iniltial position with the fall of the ram, and a yieldable braking means operating on said oscillating element to hold. the latter statio'naryisubsequentA to the fall of the ram, said braking means comprisinga cam mountted .to turn with saidoscillating member, a

spring actuated roller operating on the cam to brake-further movement ofthe oscillating member past a certain degree of movement` thereof, member carried by the roller brake and eective subsequently to the first braking action of the roller. j

4. A ramming device as claimed in claim 3, in which the cam of the braking means is mounted on a hub forming an integral part `of the oscillating member, a houslng enclosing the cam and having a radially projecting portion, said housing being loosely mounted on'said hub, a spring supported arm- 125 pivoted on the housing and carrying at its free end the said braking roller disposedA in the path of the cam, the auxiliary braking member being formed by the radial projection of the housing and a spring, whereby the and an auxiliary brake actuating 115 cam having depressed the roller and utilized the full braking capacity of the brake thereafter rotates the housing and the projection engaging the spring to impart a further lorako ing action to the movement of the oscillating member when the ram has reached its lowermost position.

5. A ramming machine as claimed in claim 1, including a stop to he engaged hy the oscillating element at a' point to its position at the time the said element is disconnected from the driving member.

'In Witness whereof, I have hereunto signed my name. l

ERNST` HJALMAR oAnLssoN.

corresponding 10 

